In 1988, the 3800, also known as the LN3 designation was introduced, and these engines would later be considered the Series I, although the older 3.8 SFI (LG3)was still available that year in some models. Designated initially by VIN code C, the 3800 LN3 was a major redesign, featuring changes such as a balance shaft, on-center bore spacing, use of a 3x/18x crank-trigger system, and other improvements. This generation continued in use in several GM products, including Australian Holdens, into the 1990s. It produced 165 hp (123 kW) from 1988 through 1991. The LN3 is very closely related to the L27 and Series I L67. In fact, supercharger-related hardware can be fitted to an LN3 without changing the cylinder heads (ECM reprogramming required).
The LN3 was replaced by the L27 in 1992 and produced 170 hp (127 kW) from 1992 onward, until it was replaced by the L36 in 1995.
The supercharged version, also known as the L67 (1992-1999) appeared in 1992 on the Buick Park Avenue Ultra, the Pontiac Bonneville SSEi and supercharged versions of the Bonneville SSE, and as optional equipment in both the 1995 Buick Riviera and the 1995 Oldsmobile Delta 88 LSS.
Introduced in 1995, the Series II is quite a different engine. Although the stroke for the 3.8 L engine remained at 3.4 in (86 mm), and the bore remained at 3.8 in (97 mm), the engine architecture was vastly changed. The piston connecting rods were 1 in (25 mm) shorter, so the crankshaft was redesigned. A new intake manifold improved breathing, and a new cylinder head had larger valves. The result was 205 hp (153 kW) and 230 ft·lbff (312 N·m), better fuel economy, and 26 lb (12 kg) lighter overall weight.
The 3800 Series II was on the Ward'* 10 Best Engines list for 1995 through 1997.
The L36 was the first Series II version of the 3800. It has a 96.52 mm bore and 86.36 mm stroke for 3.8 L (3791 cc) of displacement. Power is 205 hp (153 kW) and torque is 230 ft·lbff (312 N·m). It was first introduced in 1995.
Junk *** 2000 Impala LS, k&n cai, hd trans, etc.
Past: 1995 Bonneville SLE, Adriatic Blue Pearl.